CN106546822B - Impedance detection method, chip and the mobile terminal of the charging circuit of load - Google Patents
Impedance detection method, chip and the mobile terminal of the charging circuit of load Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a kind of impedance detection method of charging circuit, chip and terminals, including accessing constant current electronic load blocks in the charging circuit of normal connection load, and the load is controlled in the state not charged, obtain the potential difference of current value and constant current electronic load blocks both ends that the constant current electronic load blocks are sucked by the charging circuit from charging equipment, the equivalent series resistance value of the charging circuit is calculated according to the current value and potential difference, the charging strategy that the load is selected according to the equivalent series resistance value, charges；In the state that load is in and does not charge, constant current electronic load blocks are accessed in the power input interface of load, the constant current electronic load blocks suck electric current from charging equipment by charging circuit, detection obtains the potential difference at constant current electronic load blocks both ends at this time, the impedance of charging circuit can effectively be calculated, load carries out the selection of charging strategy according to the impedance, improves charge efficiency and effect.
Description
Technical field
The present invention relates to the charging fields of mobile terminal, more particularly to a kind of impedance detection side of the charging circuit of load
Method, chip and terminal.
Background technique
Currently, the charging current of mobile terminal becomes larger, charging modes become multiplicity, mainly there is low pressure fast charge, high pressure fast charge
Deng.However since the charge cable that user uses is varied, equipment charge generally uses MICRO USB or type C in addition
Interface be easy to cause the abrasion of wire and cable connector port pin with the increase of grafting number as charging input end mouth, contact
Impedance becomes larger, so that the impedance on charging circuit is unpredictable, influences the implementation of excellent charging strategy.For example setting is suitably filled
Piezoelectric voltage and charging current, reach that the charging time is short, and charge efficiency is high, purpose of the charger operation in safe bearing load.
In addition charging port is due to patching abrasion, and connector impedance becomes larger, if can't detect the variation of this impedance, no
Charging is controlled, the calorific value of the position will increase in square multiple of electric current, and accumulation of heat will lead to cable and movement
The charging interface of terminal generates overheating deforming, gives off a peculiar smell, loses itself function, consequence is serious may be due to heat transfer
User is caused to scald, property is burnt out, and brings the person or property loss to user.
There is no impedance detection function in existing mobile terminal temporarily.
Summary of the invention
Based on this, the present invention proposes the impedance detection method, chip and mobile terminal of a kind of charging circuit of load, can be with
The effective impedance for calculating charging circuit, facilitates load to carry out the selection of charging strategy according to the impedance, improve charge efficiency and
Effect.
On the one hand, the present invention proposes a kind of impedance detection method of the charging circuit of load, comprising:
Constant current electronic load blocks are accessed in the normally charging circuit of connection load, and controls the load and is in and do not fill
The state of electricity, the constant current electronic load blocks are in inside the load, connect power input and the ground connection of the load
End；
Obtain current value that the constant current electronic load blocks are sucked from charging equipment by the charging circuit and described
The potential difference at constant current electronic load blocks both ends；
The equivalent series resistance value of the charging circuit is calculated according to the current value and potential difference；
The charging strategy of the load is selected to charge according to the equivalent series resistance value.
It is described in one of the embodiments, to obtain the constant current electronic load blocks by the charging circuit from charging
The current value of equipment sucking and the potential difference at constant current electronic load blocks both ends specifically:
Obtain the different electricity of amplitude that the constant current electronic load blocks are sucked by the charging circuit from charging equipment
Flow I1 and electric current I2 and constant current electronic load blocks both ends corresponding potential difference U1 and potential difference U2；
The equivalent series resistance value that the charging circuit is calculated according to the current value and potential difference, specifically:
The equivalent series resistance value of the charging circuit is calculated according to formula RS=(U1-U2)/(I2-I1).
The charging strategy that the load is selected according to the equivalent series resistance value in one of the embodiments,
If carrying out charging includes: that the equivalent series resistance value is greater than default impedance threshold, stops or the load is not filled
Electricity.
The load is mobile terminal in one of the embodiments,.
The charging strategy that the load is selected according to the equivalent series resistance value in one of the embodiments,
The step of being charged includes: to calculate charging cable when charging according to the equivalent series resistance value under the first charge mode
The pressure drop on road, thus charging voltage of the setting to the load charging.
The load is that connection charging equipment charges in one of the embodiments, described according to the equivalent string
The step of connection impedance value selects the charging strategy of the load, is charged includes: under the second charge mode according to described etc.
It imitates series impedances and calculates the pressure drop of charging circuit when charging, and control the charging equipment compensation and improve output voltage.
On the other hand, the present invention proposes that a kind of impedance detection chip of charging circuit, the chip are being loaded for being arranged
In and connect the power input and ground terminal of load, the chip includes:
First charge control module for detecting whether load normally connects charging circuit, and is detecting that load is normal
The load is controlled when connecting charging circuit in the state not charged；
Constant current electronic load blocks connect the power input and ground terminal of the load, for passing through the charging cable
Road sucks electric current from charging equipment；
Analog to digital conversion module, when for acquiring normal connection charging circuit the power input of the chip and ground terminal it
Between potential difference；
Computing module, for calculating the equivalent series resistance value of the charging circuit according to the current value and potential difference.
In one of the embodiments, further include:
Second charge control module, for selecting the charging strategy of the load according to the equivalent series resistance value, into
Row charging.
The constant current electronic load blocks are specifically used for through the charging circuit from charging in one of the embodiments,
Equipment sucks the different electric current I1 and electric current I2 of amplitude；
The analog to digital conversion module is specifically used for the power input for acquiring the chip and ground terminal respectively corresponds acquisition
Potential difference U1 and potential difference U2；
The computing module is specifically used for calculating the equivalent of the charging circuit according to formula RS=(U1-U2)/(I2-I1)
Series impedances.
In one of the embodiments, further include:
Register, for storing the electric current I1, electric current I2, potential difference U1, potential difference U2 and the equivalent series resistance
Value.
Communication module, the equivalent series resistance value for storing the register are sent to the second charge control mould
Block.
In another aspect, the present invention also proposes a kind of mobile terminal, the impedance detection chip including above-mentioned charging circuit.
The impedance detection method of the charging circuit of above-mentioned load accesses Constant Electric Current in the charging circuit of normal connection load
Sub- load blocks, and the load is controlled in the state not charged, it obtains the constant current electronic load blocks and is filled by described
The potential difference of current value and constant current electronic load blocks both ends that electric line is sucked from charging equipment, according to the current value
The equivalent series resistance value that the charging circuit is calculated with potential difference selects the load according to the equivalent series resistance value
Charging strategy charges；It is negative in the power input interface access constant current electronic of load in the state that load is in and does not charge
Module is carried, which sucks electric current from charging equipment by charging circuit, and detection obtains constant current electronic at this time
The potential difference at load blocks both ends, can effectively calculate the impedance of charging circuit, and load carries out charging strategy according to the impedance
Selection, improve charge efficiency and effect.
The impedance detection chip and terminal of above-mentioned charging circuit, the chip is for being arranged in the load and connecting load
Power input and ground terminal, the chip load whether normally connect charging circuit including being used for detection, and negative detecting
First charge control module of the load in the state not charged is controlled when carrying normal connection charging circuit, is connected described negative
The power input and ground terminal of load, for loading mould from the constant current electronic that charging equipment sucks electric current by the charging circuit
The modulus of block, potential difference when for acquiring normal connection charging circuit between the power input and ground terminal of the chip becomes
Change the mold block, and the calculating mould of the equivalent series resistance value for calculating the charging circuit according to the current value and potential difference
Block；Electricity is sucked from charging equipment by charging circuit by the constant current electronic load blocks in the state that load is in and does not charge
Stream, detection obtain the potential difference at the impedance detection chip both ends at this time, can effectively calculate the impedance of charging circuit, load root
The selection of charging strategy is carried out according to the impedance, improves charge efficiency and effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains the attached drawing of other embodiments.
Fig. 1 is a kind of method stream of impedance detection method one embodiment of the charging circuit of load provided by the invention
Cheng Tu；
Fig. 2 is a kind of method stream of second embodiment of impedance detection method of the charging circuit of load provided by the invention
Cheng Tu；
Fig. 3 is that a kind of structure of impedance detection chip one embodiment of the charging circuit of load provided by the invention is shown
It is intended to；
Fig. 4 is that a kind of structure of second embodiment of impedance detection chip of the charging circuit of load provided by the invention is shown
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Embodiment one
It is a kind of impedance detection method one embodiment of the charging circuit of load provided by the invention referring to Fig. 1, Fig. 1
Method flow diagram, in the first embodiment, the impedance detection method of the charging circuit of the load includes:
S101 accesses constant current electronic load blocks in the charging circuit of normal connection load, and controls at the load
In the state not charged, the constant current electronic load blocks are in inside the load, connect the power input of the load
And ground terminal.
Above-mentioned load is mobile terminal, such as portable phone, Mp 3 player, laptop, smartwatch, intelligent hand
Ring, tablet computer, portable game machine etc..It is generally that power supply adaptor or mobile power source etc. is logical when mobile terminal is charged
The connection of the charging interface of overcharge cable and mobile terminal is charged, the impedance detection method of the charging circuit of the present embodiment,
After above-mentioned charging circuit normally connects, before charging to mobile terminal, the impedance of charging circuit is first calculated, according to this
Impedance selects suitable charging voltage and charging current.
Specific practice are as follows: inside mobile terminal, power input interface accesses constant current electronic load blocks, charging circuit
Concatenated load is formed with constant current electronic load blocks, is mentioned by power supply adaptor or mobile power source as charging equipment for the load
Power supply potential source, forming circuit, constant current electronic load blocks suck electric current from charging equipment by charging circuit, control mobile terminal
In the state not charged, the electric current in charging circuit is the electric current of constant current electronic load blocks sucking.
S102, obtain current value that the constant current electronic load blocks sucks from charging equipment by the charging circuit with
The potential difference at constant current electronic load blocks both ends.
The potential difference for detecting constant current electronic load blocks both ends, since constant current electronic load blocks are connected to the charging of load
Interface, i.e. power input and ground terminal, the potential difference at constant current electronic load blocks both ends are load voltage input interface two
The voltage at end, and the voltage is stored, the electric current in charging circuit is that constant current electronic load blocks pass through charging circuit
The electric current sucked from charging equipment, constant current electronic load blocks repeatedly suck the different electric current of amplitude from feeder ear, according to ohm
Loop equation of the available multiple groups of law about the equivalent series resistance of the charging circuit, it is available according to the loop equation
The equivalent series resistance value of the charging circuit.
S103 calculates the equivalent series resistance value of the charging circuit according to the current value and potential difference.
S104 selects the charging strategy of the load according to the equivalent series resistance value, charges.
The charging voltage of mobile terminal and the impedance of charging circuit are related, if the impedance of charging circuit is very big, power adaptation
Bigger decaying will occur for the output voltage of device or mobile power source after the charging circuit, reach the charging of mobile terminal
When interface, amplitude declines by a big margin, and will have a direct impact on the charge efficiency of mobile terminal, in method through this embodiment
After the equivalent series resistance value for effectively calculating charging circuit, the choosing of charging strategy is carried out according to the equivalent series resistance value
It selects, the charge efficiency and effect of mobile terminal can be improved.
To sum up, the impedance detection method of the charging circuit of the present embodiment, load in it is uncharged in the state of, by
Constant current electronic load blocks are accessed at the charging interface both ends of load, suck electric current from charging equipment by charging circuit, detection obtains
The potential difference at this constant current electronic load blocks both ends is taken, the impedance of charging circuit can be effectively calculated, is loaded according to the impedance
The selection of charging strategy is carried out, charge efficiency and effect are improved.
Embodiment two
Referring to fig. 2, Fig. 2 is a kind of second embodiment of impedance detection method of the charging circuit of load provided by the invention
Method flow diagram, in a second embodiment, the impedance detection method of the charging circuit of the load includes:
S201 accesses constant current electronic load blocks in the charging circuit of normal connection load, and controls at the load
In the state not charged, the constant current electronic load blocks are in inside the load, connect the power input of the load
And ground terminal.
After the load refers to that above-mentioned mobile terminal, charging circuit normally connect, the impedance of charging circuit is first calculated, is filled in calculating
It does not charge to terminal first when the impedance of electric line, while the impedance detection method of the charging circuit can also be applied in movement
In the charging process of terminal, according to period regular time carry out impedance detection, in time adjust mobile terminal charging voltage and
Charging current reaches better charging effect, improves charge efficiency.
S202, the constant current electronic load blocks suck the different electric current of amplitude from charging equipment by the charging circuit
I1 and electric current I2.
The voltage for remembering the voltage output end of power supply adaptor or mobile power source is U0, loads the potential difference at charging interface both ends
For U1, which is the potential difference at constant current electronic load blocks both ends, and the impedance of charging circuit is RS, constant current electronic load
Module is by successively sucking the available two groups of loop equations of two different electric currents of amplitude from charging equipment:
U0-RS*I1=U1；
U0-RS*I2=U1.
S203, obtains the electric current I1 and electric current I2 and constant current electronic load blocks both ends respectively correspond acquisition
Potential difference U1 and potential difference U2.
S204 calculates the equivalent series resistance value of the charging circuit according to formula RS=(U1-U2)/(I2-I1).
By the available above-mentioned impedance computation formula of above-mentioned two groups of loop equations, to obtain the equivalent string of charging circuit
Join impedance value.
S205, judges whether the equivalent series resistance value is greater than default impedance threshold, if so, entering step S206；If
It is no, enter step S207 or S208.
S206 stops or does not charge to the mobile terminal.
S207 calculates the pressure of charging circuit when charging under the first charge mode according to the equivalent series resistance value
Drop, thus charging voltage of the setting to the load charging.
S208 calculates the pressure of charging circuit when charging under the second charge mode according to the equivalent series resistance value
Drop, and control the charging equipment compensation and improve output voltage.
After charge controller receives the equivalent series resistance value, which is judged, if this etc.
Imitating series impedances has been more than default impedance threshold, determines that the impedance of charging circuit is excessive, and stopping charges to mobile terminal.
If the equivalent series resistance value is less than default impedance threshold, but determines the charging of mobile terminal according to the equivalent series resistance value
The input voltage of interface declines, and for common charging system, can set suitable input voltage limit value；For low pressure fast charge system
System can properly increase the output voltage for improving charging equipment by way of compensation, to improve the input electricity of mobile terminal
Pressure avoids charging current from being limited low, influences the efficiency of quick charge.
To sum up, the impedance detection method of the charging circuit of the present embodiment, after charging circuit normally connects, first to charging
The impedance of route is detected, and is in the state not charged especially by control mobile terminal, is accessed in the input interface of load
Constant current electronic load blocks, and different electric currents is successively sucked from feeder ear by the charging circuit and obtains multiple loop equations,
To calculate the equivalent series resistance of charging circuit, can also be spaced fixed during mobile terminal is charging
Time cycle detects the impedance of charging circuit, adjusts charging strategy in time, reaches better charging effect.
Embodiment three
It is a kind of impedance detection chip 30 first implementations of the charging circuit of load provided by the invention referring to Fig. 3, Fig. 3
The structural schematic diagram of example, the part of not detailed description please refers to embodiment of the method in chip embodiment.In the third embodiment,
The impedance detection chip 30 of the charging circuit of the load is used to be arranged in the load and connect the power input (VBUS) of load
With ground terminal (GND), which includes:
First charge control module 201 for detecting whether load 20 normally connects charging circuit, and is detecting load
The load 20 is controlled when 20 normal connection charging circuit in the state not charged.In the equivalent series resistance for carrying out charging circuit
It when anti-detection, does not charge to load 20, which is RS=R1+R2, which is above-mentioned mobile terminal 20.
Constant current electronic load blocks 202 connect the power input of the load, the i.e. end VBUS and ground terminal, for leading to
It crosses the charging circuit and sucks electric current from charging equipment.
The constant current electronic load blocks 202 are connected in charging circuit, and the output voltage U0 of charging equipment 10 is the circuit
Voltage source is provided, constant current electronic load blocks 202 pull out electric current from the voltage source.
Analog to digital conversion module 203, the power input of the chip and ground connection when for acquiring normal connection charging circuit
Potential difference between end.Since constant current electronic load blocks 202 and the chip connect in the both ends of load charging interface, the chip
Power input and ground terminal potential difference be 202 both ends of constant current electronic load blocks potential difference, while it is also negative for this
The potential difference of the power input interface of load.
Computing module 204, for calculating the equivalent series resistance of the charging circuit according to the current value and potential difference
Value；
Second charge control module 205, for selecting the charging strategy of the load according to the equivalent series resistance value,
It charges.Second charge control module 205 can be charging IC, for controlling the charging process of mobile terminal 2020.
To sum up, the impedance detection chip 30 of the charging circuit of the present embodiment, in the state that load is in and does not charge, connection
Constant current electronic load blocks at load charging interface both ends suck electric current from charging equipment by charging circuit, and detection obtains this
When the chip both ends potential difference, can effectively calculate the impedance of charging circuit, load carries out charging strategy according to the impedance
Selection, improve charge efficiency and effect.
Example IV
Referring to fig. 4, Fig. 4 is a kind of impedance detection chip 30 second implementations of the charging circuit of load provided by the invention
The structural schematic diagram of example, on the basis of 3rd embodiment, above-mentioned analog to digital conversion module 203 is specifically used for, and acquires described
The input terminal and output end of chip respectively correspond the potential difference U1 and potential difference U2 of acquisition.
The computing module 204 is specifically used for, and calculates the charging circuit according to formula RS=(U1-U2)/(I2-I1)
Equivalent series resistance value.
On the basis of 3rd embodiment, the impedance detection chip 30 of the charging circuit further include:
Register 206, for storing the electric current I1, electric current I2, potential difference U1, potential difference U2 and equivalent series resistance
Anti- value.
Detection is deposited into register 206 after obtaining the potential difference at chip both ends, so as to subsequent impedance computation, is calculated
It is stored in register 206 after to the equivalent series resistance value of charging circuit, to call at any time.
Communication module 207, the equivalent series resistance value for storing the register 206 are sent to second charging
Control module 205.Second charging module 207 controls the charging process of load according to the equivalent series resistance value.
The power input of the input terminal connection load of above-mentioned analog to digital conversion module 203, analog to digital conversion module 203 calculate
Module 204, register 206 and communication module 207 form the load branch of charging equipment 10, but constant current electronic load blocks 202
The electric current sucked from the voltage output end of charging equipment 10, the i.e. end VBUS only has small value by the load branch, can neglect
Slightly disregard, which returns to the ground terminal of charging equipment by charging circuit, is calculating the equivalent of the charging circuit
When series impedance, the electric current in charging circuit can be equal to the constant current electronic load blocks 202 and sucked from charging equipment 10
Electric current.
The impedance detection chip 30 of the charging circuit can integrate on a separate chip, can also be with other chipsets
At, it is such as integrated with charging IC, and be arranged in mobile terminal 20, such as portable phone, Mp 3 player, laptop, intelligent hand
In table, Intelligent bracelet, tablet computer, portable game machine etc..
To sum up, the impedance detection chip 30 of the charging circuit of the present embodiment, after charging circuit normally connects, first to filling
The impedance of electric line is detected, and the state not charged is in especially by control mobile terminal 20, in the power input of load
Constant current electronic load blocks are accessed at the both ends of interface, and successively suck different electric currents from charging equipment by charging circuit and obtain
Multiple loop equations, so that the equivalent series resistance of charging circuit is calculated, the mistake that can also be being charged in mobile terminal 20
Cheng Zhong, interval period regular time detect the impedance of charging circuit, adjust charging strategy in time, reach and preferably fill
Electric effect.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of impedance detection method of the charging circuit of load characterized by comprising
In the charging circuit of normal connection load constant current electronic load blocks are accessed, and controls the load in not charging
State, the constant current electronic load blocks are in inside the load, connect the power input and ground terminal of the load；
Obtain the current value and the constant current that the constant current electronic load blocks are sucked from charging equipment by the charging circuit
The potential difference at electronic load module both ends；
The equivalent series resistance value of the charging circuit is calculated according to the current value and potential difference；
The charging strategy of the load is selected to charge according to the equivalent series resistance value；
The current value that the constant current electronic load blocks are sucked from charging equipment by the charging circuit and described of obtaining
The potential difference at constant current electronic load blocks both ends specifically:
Obtain the different electric current I1 of amplitude that the constant current electronic load blocks are sucked by the charging circuit from charging equipment
With electric current I2 and constant current electronic load blocks both ends corresponding potential difference U1 and potential difference U2；
The equivalent series resistance value that the charging circuit is calculated according to the current value and potential difference, specifically:
The equivalent series resistance value of the charging circuit is calculated according to formula RS=(U1-U2)/(I2-I1).
2. the method according to claim 1, wherein described described negative according to equivalent series resistance value selection
The charging strategy of load stops or if carrying out charging includes: that the equivalent series resistance value is greater than default impedance threshold not to institute
Load is stated to charge.
3. the method according to claim 1, wherein the load is mobile terminal.
4. the method according to claim 1, wherein described described negative according to equivalent series resistance value selection
The charging strategy of load, the step of being charged include: to be filled under the first charge mode according to equivalent series resistance value calculating
The pressure drop of charging circuit when electric, thus charging voltage of the setting to the load charging.
5. the method according to claim 1, wherein it is described load be connection charging equipment charge, it is described
The charging strategy that the load is selected according to the equivalent series resistance value, the step of being charged include: to charge mould second
The pressure drop of charging circuit when charging is calculated under formula according to the equivalent series resistance value, and controls the charging equipment compensation
Improve output voltage.
6. a kind of impedance detection chip of charging circuit, which is characterized in that the chip is for being arranged in the load and connecting negative
The power input and ground terminal of load, the chip include:
First charge control module for detecting whether load normally connects charging circuit, and is detecting the normal connection of load
The load is controlled when charging circuit in the state not charged；
Constant current electronic load blocks connect the power input and ground terminal of the load, for by the charging circuit from
Charging equipment sucks electric current；
Analog to digital conversion module, when for acquiring normal connection charging circuit between the power input and ground terminal of the chip
Potential difference；
Computing module, for calculating the equivalent series resistance value of the charging circuit according to the current value and potential difference；
The constant current electronic load blocks are specifically used for sucking the different electric current of amplitude from charging equipment by the charging circuit
I1 and electric current I2；
The analog to digital conversion module is specifically used for corresponding electricity between the power input and ground terminal that acquire the chip
Potential difference U1 and potential difference U2；
The computing module is specifically used for calculating the equivalent series of the charging circuit according to formula RS=(U1-U2)/(I2-I1)
Impedance value.
7. chip according to claim 6, which is characterized in that further include:
Second charge control module is filled for selecting the charging strategy of the load according to the equivalent series resistance value
Electricity.
8. chip according to claim 7, which is characterized in that further include:
Register, for storing the electric current I1, electric current I2, potential difference U1, potential difference U2 and the equivalent series resistance value；
Communication module, the equivalent series resistance value for storing the register are sent to second charge control module.
9. a kind of mobile terminal, which is characterized in that the impedance including charging circuit a method according to any one of claims 6-8
Detection chip.
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| CN201610952335.2A CN106546822B (en) | 2016-10-26 | 2016-10-26 | Impedance detection method, chip and the mobile terminal of the charging circuit of load |
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| CN201610952335.2A CN106546822B (en) | 2016-10-26 | 2016-10-26 | Impedance detection method, chip and the mobile terminal of the charging circuit of load |
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| CN110768315B (en) * | 2018-07-26 | 2023-11-17 | 西安中兴新软件有限责任公司 | Protection method and system for charging interface and storage medium |
| CN109342801A (en) * | 2018-11-21 | 2019-02-15 | 江西洪都航空工业集团有限责任公司 | Direct current supply line apparatus for testing pressure drop |
| CN109828173B (en) * | 2019-03-11 | 2020-08-11 | 江苏紫米软件技术有限公司 | Load detection system and load detection method thereof |
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| CN110554240A (en) * | 2019-09-09 | 2019-12-10 | Oppo（重庆）智能科技有限公司 | Impedance detection circuit and method for charging interface and terminal equipment |
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| CN106546822A (en) | 2017-03-29 |
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